Anyone registered to vote can choose a Republican or Democratic ballot. Many of the people on the Democratic ballot (in my area) are running unopposed, so it was a good opportunity to try to get the least crazy people on the November ballot. Also, the republican ballot has 13 propositions that are not on the Democratic one, so that’s your only chance to have a say in those (and IMO they are really really bad!)
Here’s something to consider if you’re thinking about selecting a different party ballot than you normally would:
If you select a party today, you are bound by state law to stay with that party for the entire rest of the election cycle.
This choice is also public info, and it will influence what kinds of mailers you will get.
This choice is also public info, and it will influence what kinds of mailers you will get.
Even better then, you get to waste their money on top of it.